Multiple fuse plug



Dec. 27, 1938. w, SKQJEC 2,141,563

MULTIPLE FUSE PLUG Filed Feb. 28, 1938 30 'lI U/z'am Jim/'66 INVENTORATTORNEYS Patented Dec. 27, 1938 UNITED STATES PATENT OFFICE MULTIPLEFUSE PLUG ton, N. Y.

Application February 28, 1938, Serial No. 193,138

2 Claims.

This invention relates to multiple fuse plugs for insertion in theordinary house lighting or other electric circuits.

An object of the invention is to provide a fuse 5 plug having aplurality of fuses adapted to be individually and successively broughtinto the circuit whereby the fuse plug need not be discarded upon theblowing of a fuse but may be used repeatedly until the fuses are allexhausted.

A further object is to provide a multip e fuse plug in which the fusemagazine is rotatably mounted exteriorly of the body of the fuse plug soas to be easily inspected and manipulated by persons unskilled in theelectrical art.

A further object is to provide a multiple fuse plug which may be formedof a few strong simple and durable parts, which will be inexpensive tomanufacture, and which will not easily get out of order.

With the above and other objects in view the invention consists ofcertain novel details of construction and combinations of partshereinafter fully described and claimed, it being understood thatvarious modifications may be resorted to within the scope of theappended claims without departing from the spirit or sacrificing any ofthe advantages of the invention.

In the accompanying drawing forming part of this specification,

Figure 1 is a side elevation of a multiple fuse plug constructed inaccordance with the inven-- tion and showing two fuse magazines appliedto the body of the plug.

Figure 2 is an end elevation of the fuse plug shown in Figure 1 andshowing one of the fuse magazines in front elevation.

Figure 3 is an enlarged cross sectional view taken on the line 3-4 ofFigure 2 and showing the electrical connections of the fuses and showingthe stub shafts upon which the magazines are rotatably mounted.

Figure 4 is a rear elevation of one of the fuse magazines showing thearrangement of the fuses therein.

Figure 5 is a rear elevation of a modified form of the invention.

Referring now to the drawing in which like characters of referencedesignate similar parts in the various views, l designates the body ofthe plug the same being provided with conventional prongs II and springcontacts I2 which are insulated from each other by insulating washers l3and insulating tubes H, the latter forming supports for mounting studsii on the sides of the body member, which studs form stub shafts forrotatably mounting the fuse magazines 16.

Contact screws H are connected to the prongs and contact screws 18 areconnected to the spring contacts, the heads of these screws beinglocated outside of and at opposite sides of the body member 10. Theheads of the screws l1 and I8 of a prong and respective spring contactl2 on the same side of the body member ID, form means for connectingfuses in series circuit with the prong and the spring.

Rotatably mounted on each stub shaft i is a respective fuse magazine IS,the magazine being formed of insulating material, there being a dischaving a recess l9 formed on the outer face and communicating with aplurality of circuitous grooves 20. Each groove receives a respectivefuse 2| and the opposite ends of the fuse are exposed through openings22 formed at the ends of the respective groove. Enlarged contact heads23 are formed on the exposed ends of the fuse for engagement with theheads of the contact screws I1 and I8.

Springs 24 and 25 are mounted in respective circumferential grooves oneach stub shaft I5. The spring 24 is sprung into a groove 26 in theaxial opening of the magazine'while the spring 25 is disposed betweenthe magazine and the side face of the body member l0. These springsrotatably mount the magazine so that the fuses may be successively movedinto engagement with the heads of the contact screws as each fuse burnsout.

A modified form of the invention is shown in Figure 5 in which a singlefuse 21 is mounted in a magazine 28 which is formed of a bar ofinsulating material and is provided with a central opening 29 to receiveone of the stub shafts l5 and is also provided with a spring ring 30 torotatably hold the magazine on the shaft. The magazines of the typeshown in Figure 5 are designed for use as a spare to replace a multiplefuse magazine when multiple fuse magazines are not available.

In the preferred embodiment of the magazine the recess I9 is closed by atransparent pane 3| which is held in place by a split ring clamp 32engaged in a groove 33 formed in the wall of the recess.

From the above description it is thought that the construction andoperation of the invention will be fully understood without furtherexplanation.

What is claimedis:

1. A multiple fuse plug comprising a plug body,

prongs and spring contacts in the body forming circuit terminals, meansinsulating a prong and a respective spring contact from each. other,contact screws connected to the prongs, contact screws connected to thespring contacts, all of the screws having heads located outwardly of andat opposite sides of the plug body, fuse magazines rotatably mounted onsaid sides of the body, a plurality of fuses arranged in a circuitousmanner in each magazine and each terminating exteriorly of the magazinein contact ends adapted to bridge the contact screw of one of the prongsand its associated spring contact for connecting the prong and thespring in series circuit, and studs projecting from the sides of theplug body upon which said magazines are rotatabiy mounted, rotation ofthe magazines on the studs advancing the fuses successively into circuitclosing position when a fuse burns out.

2. A multiple fuse plug comprising a plug body, prongs and springcontacts in the body forming circuit terminals, means insulating a prongand a respective spring contact from each other, cons,141,sea

tact screws connected to the prongs, contact screws connected to thespring contacts. all of the screws having heads located outwardly of andat opposie sides of the plug body, fuse magazines rotatably mounted uponsaid sides of the body. a plurality of fuses arranged in a circuitousmanner in each magazine and each terminating exterior-1y of the magazinein contact ends adapted to bridge the contact screw of one of the prongsand its associated spring contact connecting the prong and the spring inseries circuit, studs proiecting from the sides of the plug body uponwhich said magazines are rotatably mounted, rotation of the magazines onthe studs advancing the fuses successively into circuit closing positionwhen a fuse burns out, and split ring springs on the studs engaging themagazines for properly positioning the magazines for rotatably mountingthe magazines at a predetermined distance from the fuse plug body toassure good electrical con- 8 tact of the fuses with the contact screws.

WILLIAM SKOJ'EC.

